Lap desk



FIG. 1 is a top view of the lap desk which embodies my design;

FIG. 2 is a bottom view of the lap desk;

FIG. 3 is a front side view of the lap desk;

FIG. 4 is a back side view of the lap desk; and,

FIG. 5 is a side view of the lap desk. 

The ornamental design for a lap desk, as shown and described. 